Piston



Patented dune24, 1930 Y ALBERT JOHN MENCHEY, or PHILADELPHLA,PENNSYLVANIA PIsroN 'A Application med January 1'4, 1929. serial No.332,380.

This invention relates to pistons -for'gas and other engines, thegeneral ob'ect of the invention being to so arrange an construct` theparts that the ring carrying section of the lpiston can be easily andquickly removed' from the cylinder without removing the section to whichthe connecting rod is attached, so that new rings can be substituted forthe old ones and the ring carr ing section, with the new rings therein,rep aced in the minimum time and with little labor.

Another object of theI invention is to make the rings and the grooves ofwedge shape in cross section so that the rings will automaticallyaccommodate themselves to the cylinder walls during the movement of thepiston and thus prevent compression rand oil leaks.

A'still further object of the invention is to provide means forpreventing piston slap. y

This invention also consists in certain other features of constructionand in the combination and arrangement of the several parts,'to

be hereinafter fully described, illustraed in.

the accompanying drawing and specifically pointed out in the'appendedclaim.

In describing the invention in detail reference will had to theaccompanying drawing wherein like characters denote like or cor--responding parts throughout the several views, and in which:-

Figure 1 is a sectional view through the improved piston and showing thesame in its cylinder.

Figure 2 is a sectional view through the piston, the section being takenat right angles to that on which Figure 1 is taken.

Figure 3 is aI bottom plan view, with the connecting rod in section.

Figure 4 is an elevation partly in section, v showing the two sectionsof the piston sepa rated.

As shown in these views, the piston is' composed of the lower or skirtsection 1 andl the headl or ring carrying section 2. The adjacent edgesof the sections overlap, as shown at 3, and the section 1 is connectedwith the rod 4 by the wristpin' 5, which has its ends arranged in'theusual bushings 6 formed in 'the section 1. Set screws 7 pass throughthezlower portions of the bushings and engage grooves 8 in the pin. Anin-l verted Y-shaped member 9 has its lower ends formed with orconnected to the upper por- ,A

tions of the bushings, and the upper end of the 4vertical part of saidmember is reduced and threaded, as shown at 10. The section 2 is formedwith a depending projection 11 at its center,`which rests on theshoulder 12 formed' at the junction of the reduced part l() with theother part of the member 9, and this projection 11 has a threaded hole13 therein for receiving the threaded part 10.

'The upper end of the section 2 is countersunk around Ithe hole, asshown at 14, to receive the nut 15 which is threaded on the end of thereduced part 10. A cotter in 16 passes through this reduced part anlocks the nut in position. This countersink 14 has its walls so Yshapedthat it canreceive 'a suitable tool so that the section 2 can be turnedto detach it from or connectl it with the threaded part 10 after the nuthas been'- removed. The section' 2 is formed .with

wedge-shaped ring receiving grooves 17 for receiving the wedge-shapedrings 18 and as the nut and v the rings are carried by the section 2, itwill l be seen that it is simply necessary to remove f the section 2from the section 1 in order to" replace the rings.. Thus it isunnecessaryto '8.0L

remove the section 1 in order to replace the rings and this eliminatesthe removal of-the crank vcase and the oil therein and the disconnectingof the rod 4 from the crank shaft.

The ywedge-shaped rings and grooves will prevent compression and oilleaks as the rings will automatically accommodate themselves to thewalls of the cylinder during the move- -ment of the'piston.

I also provide meansfor preventing piston slap, such vmeans comprising apair of oppositely arranged springs 19 arranged in the piston, and eachcomprising a central coil part and depending limbs. The end of one limbof each spring is suitably connected with the lower end ofthe piston, asshown at 20, and the other end of each limb is connected to a clamp 21which encircles the connecting rod. As the connecting rod is movingtoward one side of the piston, one spring will be compressed and theother spring stretched,

2,- v Leones@ as shown in Figure so that the. springs willeounterbalsnce each otherV and thnsho-ld the lower end of the pistonagainst the walls of the cylinder and prevent piston slap.

It is thought from the foregoing description that the advantages andnovel features of the invention will be readily apparent.

It is to be understood that changes-may be made in the construction andin the comm bination and arrangement of the several parts, provided thatsuch changes fall within v the scope of the appendedl claim.

l What I claim is A piston of the class described. comprising a lowersection and a head section, means for connecting a connecting rod to thelower section, rings' ycarried by the head' section, means fordetachahly connecting the head section with the v lower section, suchmeans comprising a member having its lower end connected with a part ofthe lower section with a threaded upwardly extending part thereon andthe head section having a de ending projection for resting on a part ofsald member, with a threaded hole 1n said projection for receiving thethreaded part, said upper section having a tool receiving recess thereinsurrounding the threaded hole and a nut in the recess engaging thethreaded part.

In testimony whereof I' aiix my signature.

ALBERT JOHN MENCHEY.

